Everyone has a right to take decisions of his life but I am not sure if any mainstream show has enough screen space for the supporting casts. So I hope that they find the 'dream role' they are looking for.
But I personally feel that we as an audience also share a part of the blame. Yes, Rathore was made to look like a fool but to say his role was not important is incorrect. They could have focussed more on their dynamics,on the Rawte-Rathore clash both professional and personal and things would have been fine. But the audience wanted a..uh..Love Story! So midway the focus of the entire show shifted. I am not blaming anyone here,but look at it objectively and you will understand. Because suddenly half the audience started drooling over the romance and half started criticizing it with all their heart(including me). I feel guilty that i focused so much on one character which I could not digest and completely ignored the other good things about the show. Now that they are gone, I realize in spite of a badly written female lead,there were so many perfect things in the show worthy of appreciation.
P.s- Please do not interpret this as me blaming the loved female lead. Of course not. I in fact have started to appreciate her work ethics of sticking to a show in spite of other commitments.